The lattice data fitted in this work have been previously presented
in Refs. [1]}, [2]}, [3]}
where more technical details can be found.
(See also Ref. [4]}.)
In particular, we use the data from a (symmetric) lattice with volume
\(V = n^4 = 128^4\) .
The lattice parameter was taken
to be \(\beta = 2.2\) , which leads to a lattice spacing \(a\)  of approximately
\(0.210~\text{fm}\) , considering \(\sigma ^{1/2} = 0.44~\text{GeV}\)  for the string
tension [5]}. Hence, the physical lattice volume is
about \((27~\text{fm})^4\) , which can be essentially considered as
infinite volume, and the lowest non-zero physical momentum allowed is
\(p_{min} = 2\,a^{-1} \sin (\pi / n ) \sim 46~\text{MeV}\) .
